As per the CBI case, Sidhu and Singh were in a relationship and she wanted to marry him, but the proposal was refused by Sidhu’s parents.
Meanwhile, Sidhu leaked certain objectionable photographs of Singh to her parents and friends causing major embarrassment to Singh and her family.
She then asked Sidhu to meet her at a park in Chandigarh’s sector 27 where she along with another assailant shot him dead on September 20, 2015, the CBI alleged.
Source: Barandbench